| 摘要 |
<p>This invention relates to a composition comprising a lignosulfonate or an alkali metal salt derivative thereof derived from sulfite waste liquor that has been subjected to alkaline oxidation, hydrolysis and partial desulfonation with subsequent resulfonation; with subsequent reaction of said resulfonated lignosulfonate with: (a) a halocarboxylic acid; (b) a halocarboxylic acid and a hydroxy-substituted lactone; (c) a hydroxysubstituted lactone as aforesaid; (d) a halocarboxylic acid and sequentially the derivative of a sugar acid containing spent sulfite liquor derived from the reaction of a spent sulfite liquor with a cyanide followed by hydrolysis of the resulting reactionproduct; or, (e) said derivative of a sugar acid-contain-ing spent sulfite liquor; as well as the method of cementing subterranean geological formations penetrated by well bores utilizing these materials in well cementing compositions.</p> |
